package chapter10.login;

import java.sql.*;
import java.util.Scanner;

public class login {
    public static void main(String[] args) throws SQLException {
        Statement stmt=null;
        ResultSet rs=null;
        Connection conn=null;
        try {
//            1.注册数据库驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
//            2.通过DriverManager获取数据库连接
            String url="jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSL=false";
            String username="root";//数据库账号
            String password="123123";//数据库密码
            conn=DriverManager.getConnection(url,username,password);
            /**
             * 终端用户登录
             */
            Scanner sc=new Scanner(System.in);
            System.out.println("用户登录");
            System.out.println("请输入你的姓名");
            String userName=sc.next();
            System.out.println("请输入你的密码");
            String userPwd=sc.next();
            String loginSQL="SELECT * FROM users WHERE name=? and password=?";
            PreparedStatement pm=conn.prepareStatement(loginSQL);
            pm.setString(1,userName);
            pm.setString(2,userPwd);
            rs=pm.executeQuery();//executeQuery返回多行数据 executUpdate()返回一个int
            System.out.println("id  | name  |  password  |  email  |  birthday");
            while (rs.next()){
                int id =rs.getInt("id");
                String name=rs.getString("name");
                if (id>0){
                    System.out.println(name+"登录成功");
                    break;
                }
            }

        }catch (ClassNotFoundException e){
            e.printStackTrace();
        }finally {
//            6.回收数据库资源
            if(rs !=null){
                try {
                    rs.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                rs=null;
            }
            if (stmt !=null){
                try {
                    stmt.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                stmt=null;
            }
            if (conn != null) {
                try{
                    conn.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                conn=null;
            }
        }
    }
}

